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The variable frequency drive industry is growing rapidly and it is now more important than ever for technicians and maintenance personnel to keep vfd installations running smoothly part of the electricians technical reference series this field guide is ideal for gaining access to information about variable frequency drives including how they work how to apply them and how to . Electricians technical reference variable frequency drives robert s carrow home worldcat home about worldcat help search search for library items search for lists search for contacts search for a library variable speed drive basics 2 electric and power transmission basics 3. Discover the tool that technicians and maintenance personnel need to keep variable frequency drive vfd installations running smoothly electricians technical reference variable frequency drives part of the electricians technical reference series this field guide highlights how vdfs work how to apply them and how to troubleshoot them. Part of the electrician s technical reference series this field guide is ideal for gaining access to information about variable frequency drives including how they work how to apply them and how to troubleshoot them. A variable frequency drive is a device used in a drive system consisting of the following three main sub systems ac motor main drive controller assembly and drive operator interface 210 211 ac motor the ac electric motor used in a vfd system is usually three phase induction motorsome types of single phase motors or synchronous motors can be advantageous in some situations but